Robert William Lamm (born October 13, 1944) is an American keyboardist, guitarist, singer and songwriter best known as a founding member of the rock band Chicago. He wrote many of the band's biggest hits, including "Questions 67 & 68", "Does Anybody Really Know What Time It Is?", "Beginnings", "25 or 6 to 4", "Saturday in the Park", "Dialogue (Part I & II)" and "Harry Truman". Lamm is one of three founding members (alongside James Pankow and Lee Loughnane) still performing with the group.